| Texto completo | |
| Autor(es): |
Faustino, Emerson
;
da Silva, Thalita Ferreira
;
Cunha, Rebeca Fabbro
;
Guelfi, Diego Roberto Vieira
;
Cavalheri, Priscila Sabioni
;
de Oliveira, Silvio Cesar
;
Caires, Anderson Rodrigues Lima
;
Casagrande, Gleison Antonio
;
Cavalcante, Rodrigo Pereira
;
Junior Amilcar, Machulek
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NANOMATERIALS; v. 12, n. 15, p. 16-pg., 2022-08-01. |
| Resumo | |
The present study aimed to evaluate the feasibility of developing low-cost N- and Fe-doped TiO2 photocatalysts for investigating the mineralization of 2,4-dimethylaniline (2,4-DMA). With a single anatase phase, the photocatalysts showed high thermal stability with mass losses of less than 2%. The predominant oxidative state is Ti4+, but there is presence of Ti3+ associated with oxygen vacancies. In materials with N, doping was interstitial in the NH3/NH4+ form and for doping with Fe, there was a presence of Fe-Ti bonds (indicating substitutional occupations). With an improved band gap energy from 3.16 eV to 2.82 eV the photoactivity of the photocatalysts was validated with an 18 W UVA lamp (340-415 nm) with a flux of 8.23 x 10(-6) Einstein s(-1). With a size of only 14.45 nm and a surface area of 84.73 m(2) g(-1), the photocatalyst doped with 0.0125% Fe mineralized 92% of the 2,4-DMA in just 180 min. While the 3% N photocatalyst with 12.27 nm had similar performance at only 360 min. Factors such as high surface area, mesoporous structure and improved E-bg, and absence of Fe peak in XPS analysis indicate that doping with 0.0125% Fe caused a modification in TiO2 structure. (AU) | |
| Processo FAPESP: | 19/26210-8 - Investigação da contribuição dos processos oxidativos avançados no tratamento multibarreira de efluentes biotratados |
| Beneficiário: | Rodrigo Pereira Cavalcante |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |